age = [21,25,21,23,22,20]
age.append(31)
print(age)
new = [29,33,30]
age.extend(new)
print(age)
print(age[0])
print(age[-1])
index = age.index(31)
print(index)
age.insert(3,33)
print(age)
del age[2]
print(age)
deleted = age.pop(6)
count = age.count(33)
print(count)
all_count = len(age)
print(all_count)